3RT1926-2ED21

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Solid-state time-delay auxiliary switch blocks for contactors with screw terminals

The solid-state time-delay auxiliary switch block is fitted onto the front side of the contactor.

Delay

The timer module, which is available in the "ON-delay" and "OFF-delay" versions, allows time-delayed functions up to 100В s (3В delay ranges).

It contains a relay with 1 NO contact and 1 NC contact; depending on the version, the relay is switched either after an ON-delay or after an OFF-delay.

Star-delta (wye-delta) starting

The "wye-delta starting" timer module is equipped with one delayed and one instantaneous NO contact, with a dead time of 50В ms between the two. The delay time of the NO contact can be adjusted between 1.5В s and 30В s.

The contactor on which the solid-state time-delay auxiliary switch block is mounted operates without a delay.

Size S00

The timer module is supplied with power directly by plug-in contacts through the coil terminals of the contactor, in parallel with A1/A2. The time function is activated by switching on the contactor on which the auxiliary switch block is mounted. The OFF-delay version operates without an auxiliary voltage; the minimum ON period is 200В ms.

A varistor is integrated in the timer module in order to damp opening surges in the contactor coil.

The solid-state time-delay auxiliary switch block cannot be mounted on size S00 coupling contactors.

Sizes S0 to S12

The timer module is supplied with power through two terminals (A1/A2); the time delay of the auxiliary switch block can be activated either by a parallel link to any contactor coil or by any power source.

The OFF-delay version operates without an auxiliary voltage; the minimum ON period is 200В ms.

A single-pole auxiliary switch block can be snapped onto the front of the contactor in addition to the timer module.

The timer module has no integrated components for overvoltage damping.